<template>
  <div>
    <el-row :gutter="15">
      <el-col :span="4" v-for="(vd,index) in fileList">
        <el-card :body-style="{'padding':'0px'}" shadow="hover">
          <div slot="header" class="clearfix" v-if="activate">
            <i class="el-icon-delete" style="float: right;" @click="removeFile(vd)"></i>
          </div>
          <video :src="vd.url" :ref="'video'+index" controls alt width="100%">您的浏览器不支持视频播放</video>
        </el-card>
      </el-col>
      <el-col :span="3" v-if="activate">
        <el-card :body-style="{'padding':'0px'}" shadow="hover">
          <el-upload
            multiple
            :action="uploadImgUrl"
            list-type="picture-card"
            :on-success="handleUploadSuccess"
            :before-upload="handleBeforeUpload"
            :limit="limit"
            :on-error="handleUploadError"
            :on-exceed="handleExceed"
            name="file"
            :on-remove="handleRemove"
            :show-file-list="false"
            :headers="headers"
            :file-list="fileList"
            :on-preview="handlePictureCardPreview"
            :class="{hide: this.fileList.length >= this.limit}"
          >
            <i class="el-icon-plus"></i>
          </el-upload>
        </el-card>
      </el-col>
    </el-row>
    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip && activate">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b></template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join('/') }}</b></template>
      的文件
    </div>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth'
import { delOss, delOssByUrl } from '@/api/system/oss'

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 1
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 1024
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['video/mp4', 'video/ogg', 'video/flv', 'video/avi', 'video/wmv', 'video/rmvb']
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    activate: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: '',
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: process.env.VUE_APP_BASE_API + '/system/oss/upload', // 上传的图片服务器地址
      headers: {
        Authorization: 'Bearer ' + getToken()
      },
      fileList: []
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',')
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === 'string') {
              item = { name: item, url: item }
            }
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  created() {
    console.log(this.activate)
  },
  methods: {
    // 删除图片
    handleRemove(file, fileList) {
      let ossId = null
      if (file.ossId) {
        ossId = file.ossId
      } else {
        ossId = file.fileName
      }
      const findex = this.fileList.map(f => f.fileName).indexOf(file.fileName)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        if (Array.isArray(this.value)) {
          this.$emit('input', this.fileList)
        } else {
          this.$emit('input', this.listToString(this.fileList))
        }
      }
      if (ossId) {
        if (typeof ossId == 'string' && ossId.indexOf('//') != -1) {
          delOssByUrl(ossId)
        } else {
          delOss(ossId)
        }
      }
    },
    removeFile(file) {
      let ossId = null
      if (file.ossId) {
        ossId = file.ossId
      } else {
        ossId = file.fileName
      }
      const findex = this.fileList.map(f => f.fileName).indexOf(file.fileName)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        if (Array.isArray(this.value)) {
          this.$emit('input', this.fileList)
        } else {
          this.$emit('input', this.listToString(this.fileList))
        }
      }
      if (ossId) {
        if (typeof ossId == 'string' && ossId.indexOf('//') != -1) {
          delOssByUrl(ossId)
        } else {
          delOss(ossId)
        }
      }
    },
    // 上传成功回调
    handleUploadSuccess(res) {
      this.uploadList.push({
        ossId: res.data.ossId,
        fileName: res.data.fileName,
        originalName: res.data.originalName,
        url: this.getPictureHost() + res.data.fileName
      })
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList)
        this.uploadList = []
        this.number = 0
        console.info('fileList::', this.fileList)
        if (Array.isArray(this.value)) {
          this.$emit('input', this.fileList)
        } else {
          this.$emit('input', this.listToString(this.fileList))
        }
        this.$modal.closeLoading()
      }
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }

      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join('/')}格式文件!`)
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.$modal.loading('正在上传，请稍候...')
      this.number++
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传失败
    handleUploadError(res) {
      this.$modal.msgError('上传失败，请重试')
      this.$modal.closeLoading()
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = ''
      separator = separator || ','
      for (let i in list) {
        strs += list[i].url + separator
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : ''
    }
  }
}
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter, .el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
